Abstract

An investigation has been made of the relationship between optical parameters such as incident angle, surface roughness, and polarization state, which has led to the development of an improved optical method. Utilizing these enhanced experimental techniques, the deposition rates of rapidly growing films consisting of either Na_2SO_4 or K_2SO_4 on a metal surface exposed to flowing combustion product gases has been measured. The experiments were performed with a film thickness less than the critical thickness for the onset of complications due to run-off. At lower metal surface temperatures, condensation of vapors to aerosols occurs before the vapor reaches the surface. Under these conditions, the mechanism of deposition is no longer determined by vapor diffusion alone but is heavily influenced by the combined action of vapor and aerosol transports. At higher surface temperatures, only the vapor deposition effect is predominant. This study also includes measurements of the dew points and evaporation rates.

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